Carriage-guide for lathes.



O- .SUHAERER. CARRIAGE GUIDE FOR LATHES.

APPLICATION FILED SEPT. 21, 1905.

972,574, 7 Patented Oct. 11,1910.

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UNTTEU flTATE PATENT @FFTUE.

OTTO SCI-IAERER, OF STUTTGART, GERMANY.

CARRIAGE-GUIDE FOR LA'II-IES.

To all whom "it may concern:

Be it known that I, OTTO SCI-IAERER, mechanical engineer, citizen of theRepublic of Switzerland, residing at Stuttgart, in the Kingdom ofWl'irtemberg, Germany, have invented certain new and useful Improvementsin Carriage-Guides for Lathes; and I do hereby declare the following tobe a full, clear, and exact description of the invention, such as willenable others skilled in the art to which it appertains to make and usethe same.

The present invention comprises a novel form of covered carriage guidefor ordinary turret lathes, in which the carriage tracks are arran edunder lateral guard flanges that in effect constitute aprons carried bythe bed cheeks and on their outer sides in the form of inverted prisms.The arrangement of the carriage tracks is characterized, among otherfeatures, by placing the same at unequal heights with reference to thecheeks in order to prevent the displacement of the carriage, and betweenthe front carriage and the adjacent guard flange, the lead screw andrack for the longitudinal motion of the carriage are placed, whichlatter part may be arranged either beneath or above the carriage tracks.By disposing the carriage tracks in the manner described, a twisting ofthe entire carriage would have to take place before it could risesimultaneously on the end points situated opposite to one another.

In the accompanying drawings formin a part of this specification, and inwhich like characters of reference indicate corresponding parts, Figure1 is an end view partly in section of one form of the invention. Fig. 2is a front elevation, partly in section. Fig. 8 is a view in plan. Fig.4 is a view similar to Fig. 1 of a modified form of the invention.

The bed cheeks a are provided at their upper portions with lateralextensions or guard flanges a that carry guides b for the spindle andslide puppet. Underneath the flanges and on the exterior of the cheeks aare arranged carriage tracks 0 having prismatic guide ways that areengaged by similar shaped guides 9 carried by the carriage andsurrounding the flanges a. For the lubrication of the guides 9 there areprovided oil chambers d, in the usual manner, in which are placedlubricating wheels 6. As will be noted by reference to Figs. 1 and l,the bed Specification of Letters Patent.

Application filed September 21, 1905.

Patented Oct. 11, 1910.

Serial No. 279,422.

cheeks a, flanges a and tracks 6 and 0 are all formed integral, therebypresenting a much more rigid structure than if these parts were madeseparately and detached, and insuring .greater accuracy in the operationof the lathe with a measurable decrease in the cost of its production.

The carriage tracks 0 are placed at unequal heights, whereby thedisplacement or one sided lifting of the carriage caused by the pressureof the tool against the work, is avoided, for the reason that in thisarrangement the turning of the entire carriage must take place if it isto rise simultaneously on both its opposite terminal points. Thus atendency to lift or tilt the carriage at one end will be met by theinherent resistance in the material of the carriage to the twistingaction thus called into play. This arrangement thus permits asimplification of the construction of the guides and an elimination ofparticular securing devices for holding the carriage in the guides. Thetrack 0 placed upon the front side of the apparatus, is, according tothe construction shown in Fig. 1, formed on its under side with atoothed rack z, and effects by means of the engagement of the toothedwheel is gearing with it, the longitudinal movement of the carriage.Upon the same side of the lathe there is placed directly over the track0 between the flanges a and the track 0 the lead screw it, whereby theside pressure of the carriage upon the guides is considerablydiminished. In the second form of the invention shown in Fig. 4, notonly is the lead screw it placed between the flanges a and one of thetracks 0, but also the toothed rack 2', whereby the traction elementsare brought as near as possible to the lathe points, and the unfavorableinfluence of the pressure of the tool upon the work is restricted asmuch as possible.

By the arrangement of the parts moving the carriage and regulating thismotion below the flanges, these latter are protected against injury byfalling shavings, lubricating material, tool and so forth.

Having thus fully described my invention, what I claim as new and desireto secure by Letters Patent of the United States, is

1. In a lathe, the combination, with bed cheeks having laterallyextending guard flanges, and provided with tracks at unequal heightsbeneath said flanges, of a carriage arranged to travel on the lathe bed,and proand a carriage-propelling member mounted above the lower trackand beneath the guard flange at a distance above the horizontal 15 planeof the higher track substantially equal to the difference in elevationof the two tracks.

In testimony whereof I hereunto affix my signature in the presence oftwo witnesses. OTTO SCHAERER. lVitnesses:

ADoLF LEHBERT, ERNST EURENMAN.

